Panels and related assemblies with mechanical locking devices

Abstract

The disclosure relates to a set of panels comprising a first panel (1) and a second panel (2) configured to assume a locked state, in which a first major surface (M1) of the first panel is disposed at an angle (φ) of 30° to 150° relative to a second major surface (M2) of the second panel. A separate tongue (6) disposed in an insertion groove (5) of the groove (3) is configured to cooperate with a tongue groove (7) provided in an edge section (4) of the second panel to lock the first and second panels together in a first direction (X) perpendicular to the first major surfaces, the edge section (4) being configured to cooperate with the groove to lock the first and second panels together in a second direction (Y) parallel to the first major surfaces (M1). The bottom of the groove has a ridge (8) disposed on an outer section of the groove at least along the second direction, the area of ​​the ridge being at least 3% of the area of ​​a rectangular boundary region extending along the boundary of the bottom.

Description

[Technical field]

[0001] The disclosure generally relates to a set of panels comprising a first panel and a second panel configured to be locked to each other at an angle of between 30° and 150°, for example essentially vertically, by a mechanical locking device. The panels may be assembled and locked to each other to provide a box such as a coffin or casket, or to provide a furniture assembly article such as a kitchen fixture, bookcase, cupboard, wardrobe or drawer. [Background technology]

[0002] WO2015 / 105449 discloses a set of panels including a first panel and a second panel arranged perpendicular to each other. The panels are provided with a mechanical locking device for locking a first edge of the first panel to a second edge of the second panel. An edge section of the second edge is insertable into the edge section groove in the first edge. A flexible tongue arranged in an insertion groove in the edge section groove cooperates with a tongue groove in the edge section of the second panel. A first thickness of the core material between the edge section groove and an outermost surface of the first edge is greater than a minimum second thickness of the core material of the edge section of the second panel.

[0003] The set of panels may provide an assembled product with a mechanical locking system having improved strength and, optionally, stability.

[0004] Despite these and many other advantages of this type of set, there may be cases where the robustness of the mechanical locking system is insufficient or compromised. For example, the tongue and groove may weaken the edge section to an unsatisfactory extent. Furthermore, in some applications, a particularly strong locking function may be required, preferably while still maintaining at least some of the advantages mentioned above. Summary of the Invention

[0005] It is therefore an objective of at least embodiments of the present disclosure to provide a set of panels that are more resistant to high loads and / or high torques, such as at the edge sections of the panels.

[0006] Another object of at least embodiments of the present disclosure is to provide a panel set including a mechanical locking device that is particularly suitable for thinner panels, for example having a thickness not exceeding 19 mm, and preferably not exceeding 16 mm.

[0007] It is yet another object of at least embodiments of the present disclosure to provide a balanced compromise between the designs of cooperating elements of a mechanical locking device such that a satisfactory robustness and / or locking strength can be provided or maintained.

[0008] It is also an object to provide a corresponding assembly article.

[0009] These and other objects and advantages which will become apparent from the description are accomplished by the various aspects, embodiments and examples described below.

[0010] According to a first aspect of the disclosure, there is provided a set of panels including a first panel and a second panel configured to assume a locked state in which a first major surface of the first panel is disposed at an angle of 30°-150°, e.g., 45°-135°, relative to a second major surface of the second panel. The set includes a groove in the first panel, an edge section of the second panel, an insertion groove in the groove of the first panel, a separate tongue disposed in the insertion groove, and a tongue groove in the edge section of the second panel. The separate tongue is configured to cooperate, preferably to engage, with the tongue groove for locking the first and second panels together in a first direction perpendicular to the first major surface, and the edge section of the second panel is configured to cooperate, preferably to engage, with the groove of the first panel for locking the first and second panels together in a second direction parallel to the first major surface and extending towards a side edge surface of the first panel. The bottom of the groove includes a ridge disposed at least on an outer section of the groove along the second direction, the ridge having an area that is at least 3% of an area of ​​a rectangular bounded region extending along a perimeter of the bottom.

[0011] The ridges may reinforce a section, preferably an edge section, of the first panel, thereby improving the locking strength. Furthermore, providing a groove in a section of the first panel, for example in its edge section, may make the panel too weak for some applications, such as when the panels are configured to be assembled to provide a box, such as a coffin or coffin, or to provide a furniture assembly article, such as a kitchen fixture, a bookcase, a cupboard, a wardrobe or a drawer. In particular, the section including the groove may not be able to resist torques exceeding a certain threshold, which may be induced, for example, when the panel is subjected to a large load and / or when an edge section of a second panel is inserted into the groove. These problems may become pronounced when the groove is deep, for example when the distance along the first direction between the bottom of the groove and the outer surface of the first panel adjacent to the bottom of the groove becomes too small. The pronounced problems may be due to the cooperating surfaces of the groove in the outer section having an excessively large level of arms around a pivot point located at the bottom of the groove, which may provide locking in the second direction. However, these potential defects are reduced, or even eliminated in some applications, by the ridges according to the first aspect, and in fact the ridges may stiffen the section, thereby providing it with greater resistance to high loads and / or torques, particularly along the second direction.

[0012] The edge section of the second panel may be shaped to accommodate the ridge, for example by including a recess. As a result of this shortening of the edge section along the first direction, for example, which may shorten the lever arm during assembly and / or in the locked state, the edge section may be strengthened.

[0013] Considering the above, a balanced compromise between the designs of the edge sections may be provided such that a sufficiently high robustness and / or strong locking strength may be provided or maintained in both the first and second panels.

[0014] The rectangular bounding area may extend along the outer boundary of the bottom along the first direction and / or the second direction.

[0015] When referring to a "panel" throughout the disclosure, the first panel and the second panel are included as examples of such a "panel."

[0016] Each panel may include a pair of faces and a pair of side edge surfaces extending between the faces. The faces and the side edge surfaces of a panel, preferably of the first panel and / or the second panel, may be arranged essentially perpendicular to each other. Furthermore, each panel may include a pair of side end surfaces (side portions) extending between its faces and its side edge surfaces. The side edge surfaces may be provided at a respective edge section of each panel.

[0017] Even though they may be defined with respect to the first panel, when describing the second panel, reference may usually also be made to a first and second (and third) orientation, for example, which may be used when referring to the second panel when the panel assumes a locked state.

[0018] The thickness of each panel may be essentially constant, except possibly at one or both edge sections of the panel, whereby the inner and outer surfaces may be provided at an essentially constant distance from each other in the first direction. For example, each panel may be substantially formed as a parallelepiped, e.g. a rectangular prism.

[0019] The first and second main surfaces may be arranged at an angle of 30° to 150° when viewed from a (cross-sectional) side, preferably along a third direction perpendicular to the first and second directions.

[0020] Generally, herein, cooperating elements (such as between a separation tongue and a tongue groove, between an edge section and a groove, between a mounting groove and a corner, or between an overlap and a face edge) may cooperate by direct engagement or may cooperate indirectly. In any of the embodiments described herein, a sealant such as wax, silicone, a rubber strip, or adhesive may be provided between the cooperating elements, thereby providing an example of indirect engagement.

[0021] In some embodiments, the area of ​​the ridge may be at least 10% of the area of ​​the rectangular bounding region, such as at least 20%, or even at least 30%.

[0022] In some embodiments, the area of ​​the ridge may not exceed 70% of the area of ​​the rectangular bounding region, such as between 3% and 70%, such as between 10% and 70%, or between 10% and 50%, such as between 20% and 60%, or between 20% and 35%.

[0023] The panels disclosed herein may include or be wood fiber based boards such as particle boards, HDF boards, MDF boards, OSB boards, solid wood boards, wood fiber composite boards or plywood boards. For example, the core of the panel may be any of these boards. Optionally, the boards may be provided with a decorative structure on at least one of their faces, such as a decorative layer or paint that at least partially encases the board. For example, the side end faces and / or side edge faces of the boards may be provided with a border strip to provide a reinforcement and / or decorative effect of the board. The set of panels according to the first aspect may be particularly advantageous for anisotropic, soft or brittle boards, which may be more prone to deformation or more susceptible to damage such as cracking or delamination under high loads and / or torques.

[0024] The panels disclosed herein may alternatively include or be a polymer-based board, which may include a thermoplastic polymer, such as PVC, or a thermosetting resin, such as a melamine formaldehyde resin.

[0025] The area of ​​the ridges and the area of ​​the border region may be determined in a cross-sectional side view of the first panel, preferably along a third direction perpendicular to the first and second directions.

[0026] The boundary region may be defined by first and second planes parallel to the first major surface, the first plane extending along an innermost portion of the groove and the second plane extending along a highest portion of the ridge along the first direction. Alternatively or additionally, the boundary region may be defined by third and fourth planes extending along the first direction and along a third direction orthogonal to the first and second directions, the third and fourth planes extending along a respective outermost wall of the base along the second direction.

[0027] The groove may be provided in an edge section of the first panel, or alternatively, or preferably additionally, the groove may be provided in an inner face of the first panel.

[0028] The width, preferably the maximum width, of the ridge along the second direction may be at least 20%, preferably at least 30%, or even at least 40% of the width, preferably the maximum width, of the base along the second direction.

[0029] The height, preferably the maximum height, of the ridge along the first direction may be 5-60% of the depth, preferably the maximum depth, of the groove, preferably 12-50%, thereby providing a stable assembly of the panels while maintaining a robust edge section and / or a strong locking function of the first panel.

[0030] The groove may further include a main groove portion disposed on an outer side of the bottom portion along the first direction. The edge section of the second panel may include a first edge portion and a second edge portion, the second edge portion configured to cooperate with the main groove portion in a locked state of the first and second panels. The second edge portion and the main groove portion may be configured to cooperate for locking in the second direction.

[0031] The first edge of the edge section of the second panel may be tapered along a first direction, moving outwardly or outwardly, whereby the second panel may be guided in the groove in an improved manner.

[0032] The outer wall of the ridge may extend between an innermost portion of the groove and a main groove portion disposed outboard of the base along the first direction.

[0033] The outer wall of the ridge may include at least one planar segment.

[0034] The outer wall of the ridge may include convex and / or concave segments. The convex segments may provide more core for the groove, and the concave segments may smooth the transition between the ridge on the one hand and the innermost and main groove portions on the other hand. In both of these scenarios, the likelihood of cracking of the edge section of the first panel may be reduced.

[0035] The shape of the outer wall of the ridge may substantially correspond to the shape of the first tapered segment of the first edge configured to face the outer wall in the locked state, such that a larger portion of the groove may be occupied by material from the edge section of the second panel, which may further improve the locking strength.

[0036] At least an inner section of the main groove portion of the groove may have an essentially constant width, preferably along the second direction, and / or at least a section of the second edge of the edge section of the second panel may have an essentially constant width, preferably along the second direction, thereby providing easy assembly of the panels while providing locking of the panels in the second direction.

[0037] The base may be asymmetric along a centerline extending along the first direction. For example, a majority of the ridge, e.g., at least 50% of the area, may be located in the outer section of the groove. In some embodiments, at least 70% of the area, and even the entire area, may be located in the outer section.

[0038] The bottom and / or the first edge may be located inside the opening of the insertion groove along the first direction in the locked state. Preferably, the bottom is provided inside a section of the groove having an essentially constant width along the second direction. Said section may be at least an inner section of the main groove portion.

[0039] The ridge, preferably the entire bottom portion, may be spaced from the edge section of the second panel by at least one space in the locked state, whereby an improved, e.g. more fail-safe, locking of the panel may be provided. For example, the panel may be locked in a first direction by cooperation between a separate tongue and tongue groove on the one hand and between a mounting groove in the edge section and a corner of the first panel on the other hand.

[0040] A thickness, eg, a minimum thickness, along the second direction between the groove and the side edge surface of the first panel may be greater than a minimum thickness of the edge section of the second panel.

[0041] The ratio between the width of the ridge and the depth of the groove along the second direction may be greater than 0.20, which may provide a balanced compromise between high load-bearing and / or tensile strength along the first and second directions and locking strength.

[0042] The opening of the groove may be wider than the inner section of the main groove portion of the groove.

[0043] The first major surface may be arranged essentially perpendicular to the second major surface, such that the second direction may be perpendicular to the second major surface of the second panel.

[0044] The side edge surfaces may be provided with edge strips, such as edge banding, which may further enhance the reinforcement and / or strength of the edge section of the first panel. Alternatively or additionally, the thickness of the edge strip may be reduced by ridges, which may allow less material to be used, reducing costs. The edge strip may also hide grooves that extend to the side edge surfaces. The edge strip may be particularly useful when the first panel, and preferably the second panel, comprises a wood fibre based board, such as particle board.

[0045] According to a second aspect of the disclosure there is provided an assembly article comprising a set of panels according to any of the embodiments of the first aspect. The assembly article may be a box such as a coffin or casket, or may provide a furniture assembly article such as a kitchen fixture, a bookcase, a cupboard, a wardrobe or a drawer.

[0046] Although the disclosed aspects have been described above primarily with reference to certain embodiments, those skilled in the art will readily appreciate that embodiments other than those disclosed above are equally possible within the scope of the disclosed aspects, as defined by the appended claims.

[0047] In general, all terms used in the claims are to be interpreted according to their ordinary meaning in the art, unless expressly stated otherwise herein. All references to "a / an / the [element, apparatus, component, means, step, etc.]" are to be openly interpreted as referring to at least one example of that element, apparatus, component, means, step, etc., unless expressly stated otherwise. References to one or more "at least one element" etc. may be shortened to "one or more elements." [Brief description of the drawings]

[0048] The disclosure will be described in more detail below in connection with exemplary embodiments and with reference to the accompanying exemplary drawings in which: [Figure 1a] Figures 1a-1c show in perspective views an embodiment of a set of panels in a locked state (Figure 1a) and in an unlocked state (Figures 1b-1c). [Figure 1b] Figures 1a-1c show in perspective views an embodiment of a set of panels in a locked state (Figure 1a) and in an unlocked state (Figures 1b-1c). [Figure 1c] Figures 1a-1c show in perspective views an embodiment of a set of panels in a locked state (Figure 1a) and in an unlocked state (Figures 1b-1c). [Figure 1d] FIG. 1d shows in cross-sectional top and side views an embodiment of a separate tongue that can be used to lock the panels in FIGS. 1a-1c. [Figure 2a] 2a-2d show cross-sectional side views of the set of panels in FIGS. 1a-1c along lines AA, BB and CC, and enlarged partial cross-sectional side views of the set of panels in FIG. 2c. [Figure 2b] 2a-2d show cross-sectional side views of the set of panels in FIGS. 1a-1c along lines AA, BB and CC, and enlarged partial cross-sectional side views of the set of panels in FIG. 2c. [Figure 2c]2a-2d show cross-sectional side views of the set of panels in FIGS. 1a-1c along lines AA, BB and CC, and enlarged partial cross-sectional side views of the set of panels in FIG. 2c. [Figure 2d] 2a-2d show cross-sectional side views of the set of panels in FIGS. 1a-1c along lines AA, BB and CC, and enlarged partial cross-sectional side views of the set of panels in FIG. 2c. [Figure 2e] 2e-2g show an embodiment of the interior surface of a first panel of a set of panels in front view. [Figure 2f] 2e-2g show an embodiment of the interior surface of a first panel of a set of panels in front view. [Figure 2g] 2e-2g show an embodiment of the interior surface of a first panel of a set of panels in front view. [Figure 3a] 3a-3d show cross-sectional side views of an embodiment of a set of panels in an unlocked state and an enlarged partial cross-sectional side view of the set of panels in FIG. 3c in a locked state. [Figure 3b] 3a-3d show cross-sectional side views of an embodiment of a set of panels in an unlocked state and an enlarged partial cross-sectional side view of the set of panels in FIG. 3c in a locked state. [Figure 3c] 3a-3d show cross-sectional side views of an embodiment of a set of panels in an unlocked state and an enlarged partial cross-sectional side view of the set of panels in FIG. 3c in a locked state. [Figure 3d] 3a-3d show cross-sectional side views of an embodiment of a set of panels in an unlocked state and an enlarged partial cross-sectional side view of the set of panels in FIG. 3c in a locked state. [Figure 3e] 3e-3f show enlarged, partial cross-sectional side views of an embodiment of a set of panels in a locked state. [Figure 3f] 3e-3f show enlarged, partial cross-sectional side views of an embodiment of a set of panels in a locked state. [Figure 4a]4a-4d show cross-sectional side views of an embodiment of a set of panels in unlocked and locked states, as well as an enlarged partial cross-sectional side view of the set of panels in FIG. 4c. [Figure 4b] 4a-4d show cross-sectional side views of an embodiment of a set of panels in unlocked and locked states, as well as an enlarged partial cross-sectional side view of the set of panels in FIG. 4c. [Figure 4c] 4a-4d show cross-sectional side views of an embodiment of a set of panels in unlocked and locked states, as well as an enlarged partial cross-sectional side view of the set of panels in FIG. 4c. [Figure 4d] 4a-4d show cross-sectional side views of an embodiment of a set of panels in unlocked and locked states, as well as an enlarged partial cross-sectional side view of the set of panels in FIG. 4c. [Figure 5a] 5a-5d show cross-sectional side views of an embodiment of a set of panels in unlocked and locked states, as well as an enlarged partial cross-sectional side view of the set of panels in FIG. 5c. [Figure 5b] 5a-5d show cross-sectional side views of an embodiment of a set of panels in unlocked and locked states, as well as an enlarged partial cross-sectional side view of the set of panels in FIG. 5c. [Figure 5c] 5a-5d show cross-sectional side views of an embodiment of a set of panels in unlocked and locked states, as well as an enlarged partial cross-sectional side view of the set of panels in FIG. 5c. [Figure 5d] 5a-5d show cross-sectional side views of an embodiment of a set of panels in unlocked and locked states, as well as an enlarged partial cross-sectional side view of the set of panels in FIG. 5c. [Figure 5e] FIG. 5e illustrates a cross-sectional side view of an embodiment of the first panel in an unlocked state. [Figure 6a] 6a-6b show cross-sectional side views of an embodiment of a set of panels in a locked state. [Figure 6b] 6a-6b show cross-sectional side views of an embodiment of a set of panels in a locked state. [Figure 7a] 7a-7b show cross-sectional side views of an embodiment of a set of panels. [Figure 7b] 7a-7b show cross-sectional side views of an embodiment of a set of panels. [Figure 7c] 7c-7d show an embodiment of an assembly article, such as a furniture assembly article, in perspective view (FIG. 7c) and side view (FIG. 7d). [Figure 7d] 7c-7d show an embodiment of an assembly article, such as a furniture assembly article, in perspective view (FIG. 7c) and side view (FIG. 7d). [Figure 7e] FIG. 7e shows an embodiment of a set of panels in a front view, for example along line EE in FIG. 1a. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0049] Various embodiments of a panel set comprising a first panel 1 and a second panel 2 will now be described, for example with reference to the embodiments in Figures 1a-1d, 2a-2g, 3a-3f, 4a-4d, 5a-5e, 6a-6b and 7a-7e. The panels are configured to assume a locked state in which the first main surface M1 of the first panel 1 is disposed at an angle φ of 30° to 150°, for example 45° to 135°, relative to the second main surface M2 of the second panel 2. In some embodiments, as shown in Figures 1a-1c, 2a-2d, 3a-3f, 4a-4d, 5a-5e and 7a-7e, the first main surface M1 is disposed essentially perpendicular to the second main surface M2, i.e. at 90°. In some embodiments, as shown in Figures 6a and 6b, the first main surface M1 is disposed at an angle φ of 45° and 135°, respectively, relative to the second main surface M2. In the embodiment, the normal N1 of the first main surface M1 may be disposed at an angle φ of 30° to 150°, for example 45° to 135°, for example angle φ=90°, relative to the normal N2 of the second main surface M2.

[0050] Here, in general, the panels 1, 2 may be configured to be assembled into an assembly item 20, which may be a box, such as a tub or coffin, or a furniture assembly item, such as a kitchen fixture, a bookcase, a cupboard, a wardrobe or a drawer. For an embodiment of such an item 20, reference is made to figures 7c-7d.

[0051] For example, as shown in Figs. 1a-1c, each panel 1, 2 may include a pair of inner side surfaces 1a, 2a and an outer side surface 1b, a pair of side edge surfaces 1c, 1d, 2c, 2d extending between the surfaces 1a, 1b, 2a, 2b, and a pair of side end surfaces 1e, 1f, 2e, 2f extending between the surfaces and the side edge surfaces 1c, 1d, 2c, 2d. The inner side surfaces 1a, 2a may be provided adjacent to each other in the locked state. The side edge surfaces 1c, 1d, 2c, 2d may be provided on the edge sections 9, 9', 4, 4' of each panel 1, 2. In the locked state, the side edge surface 2c of the edge section 4 of the second panel 2 may face the inner side surface 1a of the first panel 1 and / or may be provided on the inner side surface 1a of the first panel 1. Preferably, the edge section 9 and the edge section 4 of the first panel 1 may be configured to be adjacent to each other in the locked state. The outer surface 2b of the second panel and the side edge surface 1c of the first panel may be configured to be essentially flush with each other in the locked state. The side edge surface 1c may be disposed essentially perpendicular to the inner surface 1a and / or the outer surface 1b.

[0052] Each panel 1, 2 may comprise or be based on a wood fibre based board core, such as particle board, HDF board, MDF board, OSB board, solid wood board, wood fibre composite board or plywood board. Here, in general, the fibre orientation of the wood fibres 14, 15 of the wood fibre based board of the first panel 1 (second panel 2) may be essentially parallel to the first main surface M1 (second main surface M2), as shown diagrammatically in Fig. 3c. Optionally, the side edge faces 1c, 1d, 2c, 2d and / or the side end faces 1e, 1f, 2e, 2f of the panels may be provided with border strips.

[0053] Preferably, the panels 1, 2 have essentially uniform thicknesses T1, T2, see Figures 1b-1c. In non-limiting examples, T1, T2 are greater than 10 mm, such as 12-18 mm or 19-25 mm. Thinner panels may, for example, have a thickness not exceeding 19 mm, preferably not exceeding 16 mm, such as 8-19 mm or 10-16 mm.

[0054] The set comprises a mechanical locking device for locking the first 1 and second 2 together. The set comprises a groove 3 provided in the first panel 1, preferably on its inner side 1a and preferably in an edge section 9. The set further comprises an insertion groove 5 provided in the groove 3, in which a separate, preferably flexible, tongue 6 is arranged. The set further comprises an edge section 4 of the second panel and a tongue groove 7 provided in the edge section 4.

[0055] The first main surface M1 may be parallel to the inner surface 1a and / or the outer surface 1b, and the second main surface M2 may be parallel to the inner surface 2a and / or the outer surface 2b. Preferably, the first surface M1 and the second surface M2 extend along the inner surface 1a and the inner surface 2a, respectively.

[0056] The first panel 1 may extend in a first direction X perpendicular to the first main surface M1 and in a second direction Y, which is parallel to the first main surface M1 and extends towards a side edge surface 1c, which may be provided in an edge section 9 of the first panel 1. In the locked state, the second direction Y may be parallel to a projection N2' of the normal N2 along the first main surface M1, see Figs. 6a-6b. It is noted that for φ=90°, N2 and N2' may coincide. The first panel 1 may also extend in a third direction Z perpendicular to the first direction X and the second direction Y. Thus, the first direction X, the second direction Y and the third direction Z may be parallel to a vector extending between the surfaces 1a, 1b, between the side edge surfaces 1c, 1d and between the side end surfaces 1e, 1f, respectively.

[0057] The separate tongue 6 is configured to cooperate with the tongue groove 7 to lock the first panel 1 and the second panel 2 together in a first direction X. Further, the edge section 4 is configured to cooperate with the groove 3 to lock the first panel 1 and the second panel 2 together in a second direction Y.

[0058] The panels 1, 2 may be configured to be locked to one another by relative essentially linear displacement of the panels, preferably along a first direction X, when the first major surface M1 is arranged at an angle φ of 30° to 150°, for example essentially 90°, relative to the second major surface M2.

[0059] The groove 3 may include a bottom portion 3a and a main groove portion 3b provided outside the bottom portion 3a along the first direction X. The bottom portion 3a may be disposed inside the opening 5a of the insertion groove 5 along the first direction X. At least a portion of the main groove portion 3b may be wider than the bottom portion 3a along the second direction Y. The main groove portion 3b includes an opening section 3c and an inner section 10a. The opening 3c of the groove 3 is preferably wider than the inner section 10a of the main groove portion 3b. As shown in, for example, Figures 1a-1b, 2c, 3c, 3e-3f, 4c, 5c, 5e and 6a-6b, the bottom portion 3a may be asymmetric along a center line CX of the bottom groove 3a extending along the first direction X, preferably as seen in a cross-sectional side view.

[0060] The edge section 4 may comprise a first edge 4a and a second edge 4b, the second edge 4b ​​being configured to cooperate with the main groove 3b in the locked state, preferably with the inner section 10a. For the second panel 2, the first edge 4a may be arranged outside the second edge 4b ​​along the first direction X. For the first panel 1, in the locked state, the first edge 4a may be arranged inside the opening 5a along the first direction X. Furthermore, for the second panel 2, the first edge 4a is preferably tapered moving outwards along the first direction X. Thereby, the first edge 4a may comprise a recess 4e for accommodating the (introduced below) ridge 8 of the groove 3. Preferably, also in the locked state, the first edge 4a is asymmetric along the centre line CX. The edge section 4 may comprise, preferably at the outer side 2b, a recess 4f configured to accommodate the lip 9a of the edge section 9 in the locked state. The lip portion 9a may be provided on the outside of the groove 3 along the second direction Y. The lip portion 9a may extend in the first direction X beyond the insertion groove 5 toward the inner side surface 1a, preferably to the inner side surface 1a and / or the first main surface M1. Thereby, the side edge surface 1c may extend beyond the insertion groove 5, preferably to the inner side surface 1a.

[0061] Preferably, at least the inner section 10a of the main groove portion 3b has an essentially constant width WG along the second direction Y. Alternatively, or preferably additionally, at least the section 10b of the second edge portion 4b has an essentially constant width WE, preferably along the second direction Y, as defined in the locked state. The constant width WG and / or WE of the inner section 10a and / or section 10b may extend along the first direction X, for example corresponding to at least 5% or at least 10% of the depth D (described further below) of the groove 3, for example 5-40% of the depth, for example 10-30% of the depth. In the locked state, the inner section 10a and section 10b may be provided inside the insertion groove 5 along the first direction X.

[0062] The thickness U1, preferably the minimum, along the second direction Y between the groove 3 and the side edge surface 1c of the first panel 1 may be greater than the minimum thickness U2 of the edge section 4 of the second panel 2. For example, the thickness U1 may be the distance between the inner section 10a of the main groove portion 3b and the side edge surface 1c. The minimum thickness U2 may be determined along a direction DA provided at an angle α with respect to the second main surface M2, preferably with respect to the main surface M2, see FIG. 2d. U2 may be measured, for example, from the bottom of the tongue groove 7 to the inner surface 4h of the recessed portion 4f, for example up to the section 10b or inside the section 10b. For example, the measurement may be performed using a caliper. Preferably, the angle α is between 45° and 135°. In a non-limiting example, U1 may be at least 1.1 times or at least 1.25 times U2, for example between 2.0 times and 3.0 times. Alternatively or additionally, the ratio U1 / T1 here may generally exceed 0.35 and may preferably be between 0.35 and 0.60, for example between 0.44 and 0.55.

[0063] The separate tongue 6 may comprise a polymeric material, preferably a reinforcing structure such as glass fibre. Furthermore, as shown diagrammatically in Fig. 1d, and also as envisaged in any of the embodiments of Figs. 1a-1c, 2a-2g, 3a-3f, 4a-4d, 5a-5e, 6a-6b and 7a-7e, the separate tongue 6 may comprise a flexible protrusion 6c, which is bendable in the transverse direction T of the separate tongue and may displace the separate tongue in the insertion groove 5 upon locking, which may be for example a snap action. The displacement may be caused by a biasing force of the flexible protrusion 6c. The separate tongue 6 in Fig. 1d may be referred to as a bristle tongue, which is preferably formed by injection moulding. The separate tongue 6 may be embodied, for example, as described in WO2012 / 154113A1, page 8, line 14 to page 9, line 3, and figures 4a to 4d, the contents of which are incorporated herein by reference.

[0064] The insertion groove 5 may be provided in the inner wall 12d of the groove 3 along the second direction Y. Preferably, the insertion groove 5 is inclined with respect to the main surface M1, for example at an angle β between 10° and 60°. The insertion groove 5 may comprise a pair of oppositely arranged inner walls 5a, 5b, see for example FIG. 1d. Preferably, the separate tongue 6 is displaceably inserted into the insertion groove 5, for example by being linearly displaceable along the direction L. During locking, the separate tongue 6 may be displaced into the insertion groove 5 and then displaced from the insertion groove into the tongue groove 7. During locking, the separate tongue 6 may be displaced into the insertion groove by cooperation, for example by engagement, between the separate tongue and an edge section 4, such as the second tapered segment 4d of the first edge 4a, configured to face the innermost part 12a and / or the inner wall 12d in the locked state. The separate tongue may include two opposite displacement surfaces 6a, 6b, one or both of which may be displaceable, preferably parallel, relative to the inner walls 5a, 5b during locking.

[0065] The tongue groove 7 may be provided on the inner surface 2a of the second panel 2. With respect to the second panel 2, the tongue groove 7 is preferably provided on the inner side of the section 10b along the first direction X, the section 10b having an essentially constant width WE (see the area between the dashed lines in FIG. 2b). In some embodiments, the bottom of the tongue groove 7 is provided on the inner side of the section 10b. The tongue groove may include a tongue wall 7a configured to engage with the separate tongue 6 in the locked state. For example, the separate tongue 6 may engage with the tongue groove 7 on the outer side of the section 10a and / or on the inner side of the section 10b. Preferably, the tongue wall 7a is inclined with respect to the second main surface M2, for example by an angle δ between 25° and 65°. The tongue groove may include a counter tongue wall 7b, for example inclined with respect to the main surface M2 at an angle ε between 25° and 65°. For example, the tongue groove may be substantially triangular in shape.

[0066] The second panel 2 may include a mounting groove 10, preferably provided in the edge section 4 and on the inner side 2a. The mounting groove 10 may be provided inwardly of the tongue groove 7 along the first direction X. The mounting groove 10 may be configured to cooperate with a corner portion 11 of the first panel 1, preferably provided in the inner wall 12d and / or the inner side 1a, e.g. to form a joint therebetween.

[0067] In the locked state, the first panel 1 and the second panel 2 are preferably in contact with each other such that at least a face edge portion 1g of the inner side surface 1a, which is provided outside the groove 3 along the second direction Y, is hidden, see Fig. 2d. For example, the overlap portion 4g of the recessed portion 4f may cooperate, e.g. engage, with the face edge portion 1g.

[0068] Cooperation between the separate tongues 6 and tongue grooves 7, and preferably between the mounting grooves 10 and the corner portions 11 and / or between the overlap portions 4g and the face edge portions 1g, may provide locking of the panels 1, 2 in a first direction X. Furthermore, cooperation between the inner sections 10a and 10b, and optionally between the mounting grooves 10 and the corner portions 11, may provide locking of the panels 1, 2 in a second direction Y.

[0069] The base 3a comprises at least a ridge 8 arranged in an outer section 12 of the groove 3 along the second direction Y. For example, the outer section 12 may be provided outside the center line CX along the second direction Y. The base 3a may completely accommodate the ridge 8. The area A of the ridge 8 is at least 3%, such as at least 10% or at least 20%, of the area B of a rectangular border region R extending along the border of the base 3a. For example, the area A may be 3-70%, such as 10-70% or 10-50%, such as 20-60% or 20-35%, of the area B. Preferably, the areas A, B are determined in a cross-sectional side view of the first panel 1, for example in a view along the third direction Z, see Figs. 2d, 3d, 4d and 5d.

[0070] The boundary region R may be defined by a first plane P1 and a second plane P2 each parallel to the first main surface M1, the first plane P1 extending along the innermost portion 12a of the groove 3 and the second plane P2 extending along the highest portion 8b of the ridge 8 along the first direction X. Alternatively, or preferably additionally, the boundary region R may be defined by a third plane P3 and a fourth plane P4 each extending along the first direction X and along the third direction Z, the third plane P3 and the fourth plane P4 extending along the second direction Y along the respective outermost walls 12b, 12c of the base 3a.

[0071] The ridge 8 may be defined by at least a first plane P1 and a third plane P3. In particular, the ridge 8 may be arranged within a rectangular boundary area R.

[0072] For vertically arranged panels as shown in Figures 1a-1c, 2a-2d, 3a-3d, 4a-4d, 5a-5e and 7a-7b, the boundary region R may be defined by a third plane P3 and a fourth plane P4, each parallel to the second main surface M2, which extend along the respective outermost walls 12b, 12c of the bottom 3a provided along the second direction Y. A similar statement may be made for panels arranged at an angle φ between 30° and 150° as shown in Figures 6a-6b, provided that the second main surface M2 is rotated by an angle of 90°-φ in a clockwise direction about an axis parallel to the third direction Z, whereby a rotated second main surface M2' may be obtained and used instead of M2. After rotation, the main surfaces M1, M2' may be arranged perpendicular to each other. It can be seen that an obtuse angle φ means rotation by a negative angle, ie rotation by a positive angle φ-90° in the counterclockwise direction.

[0073] The ridge 8 may be raised along the first direction X relative to the innermost portion 12a. For example, it may be raised relative to the plane P1. The outer wall 8a of the ridge may extend between the innermost portion 12a and the main groove portion 3b. The innermost portion 12a may be the innermost wall of the groove 3, e.g. planar, and preferably extending along the second direction Y, as shown for example in Figures 2a, 3a, 3e-3f, 5a and 5e. Alternatively, the innermost portion 12a may be the deepest section of the outer wall 8a, preferably inclined, as shown for example in Figure 4a.

[0074] The ridge 8 may have extensions in the first direction X and the second direction Y and may extend along a portion of the width WB of the bottom 3a along the second direction Y, see Figs. 2a, 3a, 4a, 5a and 5e. For example, the ridge 8 may be located only in the outer section 12. The width W of the ridge 8 along the second direction Y may be at least 20%, preferably at least 30%, of the width WB of the bottom 3a. For example, W may be 20-80% or 20-60%, for example 30-50%, of WB. Furthermore, the height H of the ridge 8 along the first direction X may be 5-60%, preferably 12-50%, of the depth D of the groove 3. The width W and / or the height H may be a maximum width and / or a maximum height. The depth D may be a distance, for example a maximum distance, along the first direction X from the innermost portion 12a to the inner side 1a of the first panel. The ratio W / D between the width W and the depth D may be greater than 0.20, such as 0.20 to 0.60, such as 0.25 to 0.50. In a non-limiting example, 1 mm≦W≦WB, such as 2 mm≦W≦5 mm and / or 1 mm≦H≦4 mm.

[0075] The area B may be calculated as WB*H. For a substantially triangular ridge 8, the area A may be calculated as W*H / 2.

[0076] In some embodiments, the ridge 8 may extend along substantially the entire width WB of the base 3a, as shown, for example, in Figures 4a-4d.

[0077] The outer wall 8a may comprise at least one planar segment. The outer wall 8a comprises a single, preferably inclined, planar segment in Figures 2a-2d and 4a-4d, and a plurality, e.g. two or three, planar elements in Figures 3a-3d. For example, the ridge 8 may be substantially triangular, preferably as seen in cross-sectional side view. The angle γ between the inclined planar outer wall 8a and the second main surface M2 may be between 0° and 80°, e.g. between 25° and 70°.

[0078] In Figures 3e-3f and 5e, outer wall 8a comprises a convex segment, and in Figures 3f and 5a-5d, outer wall 8a comprises a concave segment. The area A of the ridge comprising the convex segment, for example in Figure 5e, may be up to 70% of the area B.

[0079] For example, as shown in Figures 2a-2d, 3a-3f, 4a-4d, 6a-6b and 7a-7c, the shape of the outer wall 8a may substantially correspond to the shape of the first tapered segment 4c of the first edge portion 4a configured to face the outer wall in the locked state.

[0080] In the locked state, the ridge 8, preferably the entire bottom 3a, may be spaced from the edge section 4 by at least one space S1, S2, S3, see for example Figures 2c, 3c, 4c and 5c. In any of these embodiments, the inner section 10a and section 10b preferably cooperate.

[0081] In some embodiments, an edge strip 1h is provided, such as by being glued, on the side edge surface 1c, see Figs. 7a-7b. In a first example, as shown in Fig. 7a, the outer surface 2b of the second panel and the edge strip 1h, preferably the outer surface 1j of the edge strip 1h, may be essentially flush with each other in the locked state. In a second example, as shown in Fig. 7b, the outer surface 2b and the side edge surface 1c may be essentially flush with each other in the locked state, and / or the edge strip 1h, preferably the outer surface 1j of the edge strip 1h, may extend outside the side edge surface 1c along the second direction Y. Optionally, side edge surfaces 1d and / or 2d may also be provided together with the edge strips 1i, 2h, but these may also be omitted.

[0082] The edge strips 1h, 1i, 2h may be edge bandings. For example, the edge strips 1h, 1i, 2h may comprise paper, veneer, or thermoplastic strips such as polypropylene, PP, or acrylonitrile butadiene styrene, ABS. The paper may be impregnated or otherwise comprise a resin such as melamine formaldehyde resin. The thickness TS, preferably maximum, of the edge strips 1h, 1i, 2h may be less than 2.0 mm, preferably 0.4-1.5 mm, more preferably 0.5-1.0 mm. The edge strips may be adhered to the side edge faces 1c, 1d, 2d by adhesive. For example, a hot melt adhesive may be used or the edge strips may comprise an adhesive layer configured to melt from activation by hot air or laser. Any of the embodiments disclosed herein may include one or more edge strips 1h, 1i, 2h, for example in any of Figures 1a-1c, 2a-2g, 3a-3f, 4a-4d, 5a-5e, 6a-6b, and 7c-7e.

[0083] In any of the embodiments herein, such as in any of Figures 1a-1c, 2a-2g, 3a-3f, 4a-4d, 5a-5e, 6a-6b and 7a-7e, the insertion groove 5 may extend along at least 50% of the length L1 of the first panel along the third direction Z, such as along its entire length L1. Alternatively, or preferably additionally, the edge section 4, preferably the edge section 4 including the tongue groove 7, may have an essentially constant cross-section along at least 50% of the length L2 of the second panel along the third direction Z, such as along its entire length L2.

[0084] As in any of the embodiments herein, such as in any of the figures 1a-1c, 2a-2g, 3a-3f, 4a-4d, 5a-5e, 6a-6b and 7a-7e, the ridge 8 may extend along a length L0 of at least 5%, preferably at least 50%, even the entire, of the longitudinal length LG of the groove 3 along the third direction Z. The remaining part of the longitudinal length LG not having the ridge 8 may include a raised portion 8' having an area A' smaller than 3% of the area B, or the raised portion 8' may for example be absent, with reference to figures 2c, 2f and 5d, a groove 3 not having a ridge 8 is shown in the outer section 12 by a dashed line 3'. For example, the groove 3 may have substantially the full depth. Other features of the raised portion 8' may be the same as for the ridge 8. For example, area A' may be defined by planes P1, P2 and / or P3, P4, see FIG. 5d, and further, raised portion 8' may include a concave segment.

[0085] In a first example, the groove 3 extends along the entire length L1 of the first panel and the ridge 8 extends along substantially the entire length of the groove 3, see FIG. 2e. In a second example, the groove 3 extends along the entire length L1 of the first panel and the ridge 8 extends along less than 20% of the length L1, for example in an area along the side edge faces 1c, 1d, for example in the vicinity of one or both side end faces 1e, 1f, see FIG. 2f, whereby it may provide localized reinforcement. In a third example, the groove 3 extends along a portion of the length L1 and is thereby preferably defined by one or two side walls 13 and the ridge 8 extends preferably along the entire length LG, see FIG. 2g. By the one or more side walls 13, the groove 3 may be hidden at the side end faces 1e and / or 1f. The edge section 4 may include one cavity 16 or two cavities for accommodating the respective side walls 13, see FIG. 7e.

[0086] It is emphasized that the embodiment shown in Figures 6A-6B is exemplary and any of the other elements 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, etc. described herein may be used therein. For example, the embodiments in the enlarged areas shown in any of Figures 2d, 3d-3f, 4d or 5d-5e are also contemplated for the panels 1, 2 of Figures 6a or 6b. In addition, the panels 1, 2 of Figures 6a-6b are adapted to be assembled into an assembly article 20, such as a box or furniture assembly article, for example similar to the embodiment shown in Figures 7c-7d. Optionally, the article 20 may include a back member 17, for example provided in and / or nailed to a back groove of the panel.

[0087] Aspects of the disclosure have been primarily described above with reference to several embodiments. However, as will be readily understood by those skilled in the art, other embodiments than those disclosed above are equally possible within the scope of the disclosure as defined by the appended claims. For example, the set of panels may include a plurality of panels similar to the first and second panels, which may be assembled and locked together in a manner similar to the first and second panels. It is further understood that the first and / or second panels disclosed herein may be further provided with mechanical locking devices at the opposing edge sections 9' and / or 4', which are similar to the mechanical locking devices provided at the edge sections 4 and / or 9 (or 9 and / or 4) described herein, see Figs. 7c-7d. example According to SS-EN14749:2016, the shelf support strength of a pair of sample panels 1, 2 in the form of leaf-shaped particleboard mounted in an assembled piece of box-shaped furniture was tested. The piece of furniture included two sets of sample panels 1, 2 and a backing member 17 of a 3 mm sample of leaf-shaped HDF, see figure 7d. 659-690 kg / m 3 and sample pairs R1, R2, R3, R4 and Q1, Q2, Q3, Q4 with densities of 0.40 to 0.58 and internal bonds of 672 to 688 kg / m 3Sample pairs R1', R2', R3' and Q1', Q2', Q3' were tested with a density of 0.02 mm and an internal bond of 0.64. The internal bond was tested to EN319. The samples of Panel 1 and Panel 2 had face dimensions of 720 x 350 mm and 384.6 x 350 mm, respectively, and all samples had a thickness T1, T2 of 16 mm. The samples of Panel 1 included grooves 3 in their respective edge sections 9, 9', and the samples of Panel 2 included a pair of oppositely disposed edge sections 4, 4', each extending 8.3 mm from its main part. Furthermore, the grooves were characterized by WB = 6.15 mm, D = 8.5 mm and U1 = 9.0 mm. Each groove was bounded by a side wall 13, whereby the total depth D of the groove started 50 mm from one side end face 1f and opened laterally at the other side end face 1e, see FIG. 7e. The cross section of the groove was constant along its entire longitudinal length LG. The cross section of the edge sections 4, 4' of the sample of the second panel 2 was constant along its entire length L2 except at the location of a cavity 16 extending 50 mm from one side edge 2f.

[0088] The first panel 1 samples Q1-Q4 and Q1'-Q3' include a substantially triangular shaped protuberance having W=3mm and H=2mm, thereby providing a thickness of about 3mm. 2 and the bottom area B is approximately 12.3 mm 2 and A / B was shown to be about 0.24, corresponding to 24%. Panel 1 samples R1-R4 and R1'-R3' contained a standard type of groove, i.e. a groove without ridges, such as the one shown by dashed line 3' in Figure 2c. Nevertheless, this groove had an outer radius of about 1.2 mm, thereby being about 0.31 mm. 2 Thus, compared with the area B of the base, which was the same as above, the corresponding value of A' / B for these reference samples was approximately 0.01, corresponding to 1%.

[0089] The samples of panels 1, 2 R2, R3, R4, Q2, Q3, Q4, R1', R2', R3', Q1', Q2' and Q3' were provided with edge banding at their side edge faces. The outer faces 1j of the edge strips 1h extended outside the side edge faces 1c as shown in Fig. 7b. Their thicknesses TS are summarized in Table 1. R1 and Q1 were not provided with any edge banding. Table 1 also shows the test results of each sample pair carried out according to SS-EN14749:2016. Typical cracks CR of the reference sample of the first panel 1 are shown diagrammatically in Fig. 2c. It can be seen that the failure rate of each sample Q1-Q4 was significantly reduced compared to the reference samples R1-R4. Moreover, sample Q3' passed the test while reference sample R3' did not. Therefore, having the ridges significantly improved the resistance to dynamic loads. Additionally, thinner edge banding can be used while still providing the aforementioned resistance.

[0090] [Table 1]

[0091] Embodiment Item 1: A panel set comprising a first panel (1) and a second panel (2) configured to be in a locked state, in which a first main surface (M1) of the first panel is disposed at an angle (φ) of 30° to 150°, for example, 45° to 135°, relative to a second main surface (M2) of the second panel in the locked state, A groove (3) provided in the first panel; an edge section (4) of the second panel; an insertion groove (5) provided in the groove (3) of the first panel, in which a separate tongue portion (6) is disposed; a tongue groove (7) provided in the edge section (4) of the second panel; the separate tongues (6) are configured to cooperate with the tongue grooves (7) to lock the first panel (1) and the second panel (2) together in a first direction (X) perpendicular to the first main surface (M1); the edge section (4) of the second panel is configured to cooperate with the groove (3) of the first panel to lock the first panel (1) and the second panel (2) together in a second direction (Y) that is parallel to the first main surface (M1) and extends towards a side edge surface (1c) of the first panel; the bottom (3a) of the groove (3) has a ridge (8) arranged at least in an outer section (12) of the groove (3) along the second direction (Y), the area (A) of the ridge (8) being at least 3% of the area (B) of a rectangular border region (R) extending along the border of the bottom (3a); A set of panels.

[0092] Item 2. The set of item 1, wherein the area (A) of the raised portion (8) and the area (B) of the border region (R) are defined in a cross-sectional side view of the first panel (1).

[0093] Item 3 The boundary region (R) is a first plane (P1) and a second plane (P2) parallel to the first main surface (M1), the first plane (P1) extending along the innermost part (12a) of the groove (3) and the second plane (P2) extending along the first direction (X) along the highest part (8b) of the raised portion (8); and / or a third plane (P3) and a fourth plane (P4) extending along the first direction (X) and a third direction (Z) perpendicular to the first direction (X) and the second direction (Y), the third plane (P3) and the fourth plane (P4) extending along the second direction (Y) along the outermost wall portions (12b; 12c) of the bottom portion (3a); 3. The set according to item 1 or 2, defined by:

[0094] Item 4. The set according to any of the preceding items, wherein the groove (3) is provided in an edge section (9) of the first panel (1).

[0095] Item 5. The set according to any of the preceding items, wherein the width (W) of the raised portion (8) along the second direction (Y) is at least 20% of the width (WB) of the bottom portion (3a) along the second direction (Y), preferably at least 30%.

[0096] Item 6. The set according to any of the preceding items, wherein the height (H) of the raised portion (8) along the first direction (X) is 5 to 60% of the depth (D) of the groove (3), and preferably 12 to 50%.

[0097] Item 7. The set according to any of the preceding items, wherein the groove (3) further comprises a main groove portion (3b) provided on the outside of the bottom portion (3a) along the first direction (X), and the edge section (4) comprises a first edge portion (4a) and a second edge portion (4b), and the second edge portion (4b) is configured to cooperate with the main groove portion (3b) in the locked state.

[0098] Item 8. The set of any of the preceding items, wherein the first edge portion (4a) of the edge section (4) is tapered moving outward along the first direction (X).

[0099] Item 9. The set according to any of the preceding items, wherein the outer wall (8a) of the raised portion (8) extends between an innermost portion (12a) of the groove (3) and a main groove portion (3b) provided outside the bottom portion (3a) along the first direction (X).

[0100] Item 10. The set of any of the preceding items, wherein the outer wall (8a) of the ridge (8) comprises at least one planar segment.

[0101] Item 11. The set according to any of the preceding items, wherein the outer wall (8a) of the raised portion (8) includes convex segments and / or concave segments.

[0102] Item 12. The set of any of the preceding items, wherein a shape of the outer wall (8a) of the raised portion (8) substantially corresponds to a shape of the tapered segment (4c) of the first edge portion (4a) configured to face the outer wall in the locked state.

[0103] Item 13. The set of any of the preceding items, wherein at least an inner section (10a) of a main groove portion (3b) of the groove (3) has an essentially constant width (WG) and / or at least a section (10b) of a second edge portion (4b) of the edge section (4) has an essentially constant width (WE).

[0104] Item 14. The set according to any of the preceding items, wherein the bottom portion (3a) is asymmetric along a center line (CX) extending along the first direction (X).

[0105] Item 15. The set according to any of the preceding items, wherein the bottom portion (3a) and / or the first edge portion (4a) is disposed inside the opening (5a) of the insertion groove (5) along the first direction (X) in the locked state.

[0106] Item 16. The set of any of the preceding items, wherein the raised portion (8), preferably the entire bottom portion (3a), is spaced from the edge section (4) of the second panel by at least one space (S1; S2; S3) in the locked state.

[0107] Item 17. The set of any of the preceding items, wherein a thickness (U1) along the second direction (Y) between the groove (3) and the side edge surface (1c) of the first panel is greater than a minimum thickness (U2) of the edge section (4) of the second panel.

[0108] Item 18. The set of any of the preceding items, wherein the ratio (W / D) between the width (W) of the ridge (8) and the depth (D) of the groove (3) along the second direction (Y) is greater than 0.20.

[0109] Item 19. The set of any of the preceding items, wherein the first major surface (M1) is disposed essentially perpendicular to the second major surface (M2).

[0110] Item 20. The set according to any of the preceding items, wherein an edge strip (1h) is provided on the side edge surface (1c).

[0111] Item 21. An assembly article (20) comprising a set of panels according to any one of the preceding items 1 to 20.

Claims

1. A set of panels comprising a first panel (1) and a second panel (2) configured to assume a locked state, wherein in the locked state, a first major surface (M1) of the first panel is disposed at an angle (φ) of 30° to 150°, for example 45° to 135°, with respect to a second major surface (M2) of the second panel, a side edge surface (1c) and an inner surface (1a) of the first panel are disposed essentially perpendicular to each other, and the set further comprises: a groove (3) provided on the inner surface (1a) and in an edge section (9) of the first panel; an edge section (4) of the second panel; an insertion groove (5) provided in the groove (3) of the first panel, the insertion groove (5) being configured to receive a separate tongue portion (6); a tongue groove (7) provided in the edge section (4) of the second panel; the separate tongue portion (6) is configured to cooperate with the tongue groove (7) to lock the first panel (1) and the second panel (2) to each other in a first direction (X) perpendicular to the first major surface (M1); the edge section (4) of the second panel is configured to cooperate with the groove (3) of the first panel to lock the first panel (1) and the second panel (2) to each other in a second direction (Y) parallel to the first major surface (M1) and extending towards the side edge surface (1c) of the first panel; a raised portion (8) is provided at least in an outer section (12) of the groove (3) along the second direction (Y), and an area (A) of the raised portion (8) is at least 10% of an area (B) of a rectangular boundary region (R) extending along a boundary of the bottom (3a); A set of panels.

2. The set according to claim 1, wherein the area (A) of the raised portion (8) and the area (B) of the boundary region (R) are determined in a cross-sectional side view of the first panel (1).

3. The boundary region (R) is a first plane (P1) and a second plane (P2) parallel to the first major surface (M1), the first plane (P1) extending along a innermost portion (12a) of the groove (3), the second plane (P2) extending along a highest portion (8b) of the raised portion (8) in the first direction (X), and / or A third plane (P3) and a fourth plane (P4) that extend along the first direction (X) and extend along a third direction (Z) perpendicular to the first direction (X) and the second direction (Y), wherein the third plane (P3) and the fourth plane (P4) extend along the respective outermost wall portions (12b; 12c) of the bottom portion (3a) along the second direction (Y), the third plane (P3) and the fourth plane (P4) The set according to claim 1, defined by

4. The width (W) of the raised portion (8) along the second direction (Y) is at least 20%, preferably at least 30% of the width (WB) of the bottom portion (3a) along the second direction (Y), the set according to claim 1.

5. The height (H) of the raised portion (8) along the first direction (X) is 5 to 60%, preferably 12 to 50% of the depth (D) of the groove (3), the set according to claim 1.

6. The groove (3) further includes a main groove portion (3b) provided outside the bottom portion (3a) along the first direction (X), the edge section (4) includes a first edge portion (4a) and a second edge portion (4b), and the second edge portion (4b) is configured to cooperate with the main groove portion (3b) in the locked state for locking in the second direction (Y), the set according to claim 1.

7. The first edge portion (4a) of the edge section (4) is tapered to move outward along the first direction (X), the set according to claim 1.

8. The outer wall (8a) of the raised portion (8) includes at least one planar segment, the set according to claim 1.

9. At least the inner section (10a) of the main groove portion (3b) of the groove (3) has an essentially constant width (WG), and / or at least the section (10b) of the second edge portion (4b) of the edge section (4) has an essentially constant width (WE), the set according to claim 1.

10. The bottom portion (3a) is asymmetric along a center line (CX) extending along the first direction (X), the set according to claim 1.

11. The bottom portion (3a) and / or the first edge portion (4a) are arranged inside the opening (5a) of the insertion groove (5) along the first direction (X) in the locked state, the set according to claim 1.

12. The raised portion (8) is preferably such that the entire bottom (3a) is spaced from the edge section (4) of the second panel by at least one space (S1; S2; S3) in the locked state, the set according to claim 1.

13. The ratio (W / D) between the width (W) of the raised portion (8) along the second direction (Y) and the depth (D) of the groove (3) exceeds 0.20, the set according to claim 1.

14. The first major surface (M1) is arranged essentially perpendicular to the second major surface (M2), the set according to claim 1.

15. An edge strip (1h) is provided on the side edge surface (1c), the set according to any one of claims 1 to 14.

Images